An automotive relay driver with a 5V regulator, the A2550 combines the functions of a voltage regulator, watchdog, and reset, as well as 3 low-side DMOS relay driver outputs. Primarily targeted at automotive applications, this IC is designed to provide robust performance over extended voltage and temperature ranges.
Three low-side DMOS drivers are meant to drive relay coils of up to 250 mA each. Each driver integrates rugged voltage clamps that survive automotive load dump pulses up to 48V. The 40V rating on VBB also ensures adequate survival in harsh automotive environments.
A 5V linear regulator provides 40 mA of output current with a tolerance of 2% over the operating temperature range. To enhance the IC's usefulness in automotive applications, the 5V regulator output as well as the 3 low-side driver outputs are protected against over-current conditions. The A2550 also includes power-on reset circuitry (NPOR) as well as an integrated watchdog circuit. Combined, they service the monitoring and reset requirements of a system microprocessor.
- 3 independent low-side DMOS output drivers
- Short-circuit protection of drivers
- Eliminates need for flyback diodes on relays
- Thermal shutdown
- Separate precision 5V regulator (2%)
- Current clamp on 5V regulator
- 16-pin TSSOP package with exposed thermal pad
- Programmable reset (NPOR) delay time
- Programmable watchdog
- Automotive voltage and temperature ranges
- Active clamps for automotive load dump specifications
- Lead-free
